L Carnitine Injection HOMEKIT L Carnitine Injections for Weight Loss Prescription Weight Loss, Inc. Injectable L Carnitine Dosage For Weight Loss Weight Wise Weight Loss Center L Carnitine injection is recommended at 1 ampule every 2 3 days for best results. The L Carnitine is taken intravenously either by normal injection or using a butterfly needle. After taking this L Carnitine, you L Carnitine Injectable Factor Health MD